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308 lines
7.2 KiB
Go
308 lines
7.2 KiB
Go
// Package xlsx implements the sq driver for Microsoft Excel.
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package xlsx
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import (
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"context"
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"database/sql"
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"io"
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"github.com/neilotoole/lg"
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"github.com/tealeg/xlsx/v2"
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"github.com/neilotoole/sq/libsq/core/cleanup"
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"github.com/neilotoole/sq/libsq/core/errz"
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"github.com/neilotoole/sq/libsq/core/options"
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"github.com/neilotoole/sq/libsq/driver"
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"github.com/neilotoole/sq/libsq/source"
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)
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const (
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// Type is the sq source driver type for XLSX.
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Type = source.Type("xlsx")
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)
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// Provider implements driver.Provider.
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type Provider struct {
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Log lg.Log
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Files *source.Files
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Scratcher driver.ScratchDatabaseOpener
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}
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// DriverFor implements driver.Provider.
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func (p *Provider) DriverFor(typ source.Type) (driver.Driver, error) {
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if typ != Type {
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return nil, errz.Errorf("unsupported driver type %q", typ)
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}
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return &Driver{log: p.Log, scratcher: p.Scratcher, files: p.Files}, nil
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}
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var _ source.TypeDetectFunc = DetectXLSX
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// DetectXLSX implements source.TypeDetectFunc, returning
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// TypeXLSX and a score of 1.0 valid XLSX.
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func DetectXLSX(ctx context.Context, log lg.Log, openFn source.FileOpenFunc) (detected source.Type, score float32,
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err error,
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) {
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var r io.ReadCloser
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r, err = openFn()
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if err != nil {
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return source.TypeNone, 0, errz.Err(err)
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}
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defer log.WarnIfCloseError(r)
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data, err := io.ReadAll(r)
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if err != nil {
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return source.TypeNone, 0, errz.Err(err)
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}
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// We don't need to read all rows, one will do.
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const rowLimit = 1
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_, err = xlsx.OpenBinaryWithRowLimit(data, rowLimit)
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if err != nil {
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return source.TypeNone, 0, nil
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}
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return Type, 1.0, nil
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}
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// Driver implements driver.Driver.
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type Driver struct {
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log lg.Log
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scratcher driver.ScratchDatabaseOpener
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files *source.Files
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}
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// DriverMetadata implements driver.Driver.
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func (d *Driver) DriverMetadata() driver.Metadata {
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return driver.Metadata{
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Type: Type,
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Description: "Microsoft Excel XLSX",
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Doc: "https://en.wikipedia.org/wiki/Microsoft_Excel",
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}
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}
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// Open implements driver.Driver.
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func (d *Driver) Open(ctx context.Context, src *source.Source) (driver.Database, error) {
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r, err := d.files.Open(src)
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if err != nil {
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return nil, err
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}
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defer d.log.WarnIfCloseError(r)
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b, err := io.ReadAll(r)
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if err != nil {
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return nil, errz.Err(err)
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}
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xlFile, err := xlsx.OpenBinary(b)
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if err != nil {
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return nil, err
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}
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scratchDB, err := d.scratcher.OpenScratch(ctx, src.Handle)
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if err != nil {
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return nil, err
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}
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clnup := cleanup.New()
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clnup.AddE(scratchDB.Close)
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err = xlsxToScratch(ctx, d.log, src, xlFile, scratchDB)
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if err != nil {
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d.log.WarnIfError(clnup.Run())
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return nil, err
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}
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return &database{log: d.log, src: src, impl: scratchDB, files: d.files, clnup: clnup}, nil
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}
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// Truncate implements driver.Driver.
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func (d *Driver) Truncate(ctx context.Context, src *source.Source, tbl string, reset bool) (affected int64, err error) {
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// TODO: WE could actually implement Truncate for xlsx.
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// It would just mean deleting the rows from a sheet, and then
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// saving the sheet.
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return 0, errz.Errorf("source type %q (%s) doesn't support dropping tables", Type, src.Handle)
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}
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// ValidateSource implements driver.Driver.
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func (d *Driver) ValidateSource(src *source.Source) (*source.Source, error) {
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d.log.Debugf("Validating source: %q", src.RedactedLocation())
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if src.Type != Type {
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return nil, errz.Errorf("expected source type %q but got %q", Type, src.Type)
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}
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return src, nil
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}
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// Ping implements driver.Driver.
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func (d *Driver) Ping(ctx context.Context, src *source.Source) (err error) {
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r, err := d.files.Open(src)
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if err != nil {
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return err
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}
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defer d.log.WarnIfCloseError(r)
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b, err := io.ReadAll(r)
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if err != nil {
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return errz.Err(err)
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}
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_, err = xlsx.OpenBinaryWithRowLimit(b, 1)
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if err != nil {
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return errz.Err(err)
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}
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return nil
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}
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// database implements driver.Database.
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type database struct {
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log lg.Log
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src *source.Source
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files *source.Files
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impl driver.Database
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clnup *cleanup.Cleanup
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}
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// DB implements driver.Database.
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func (d *database) DB() *sql.DB {
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return d.impl.DB()
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}
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// SQLDriver implements driver.Database.
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func (d *database) SQLDriver() driver.SQLDriver {
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return d.impl.SQLDriver()
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}
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// Source implements driver.Database.
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func (d *database) Source() *source.Source {
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return d.src
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}
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// SourceMetadata implements driver.Database.
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//
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// TODO: the implementation of SourceMetadata is out
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// of sync with the way we import data. For example, empty
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// rows are filtered out during import, and empty columns
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// are discarded. Thus SourceMetadata needs an overhaul to
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// bring its reporting into line with import.
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func (d *database) SourceMetadata(ctx context.Context) (*source.Metadata, error) {
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meta := &source.Metadata{Handle: d.src.Handle}
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var err error
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meta.Size, err = d.files.Size(d.src)
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if err != nil {
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return nil, err
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}
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meta.Name, err = source.LocationFileName(d.src)
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if err != nil {
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return nil, err
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}
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meta.FQName = meta.Name
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meta.Location = d.src.Location
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meta.SourceType = Type
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b, err := d.files.ReadAll(d.src)
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if err != nil {
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return nil, errz.Err(err)
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}
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xlFile, err := xlsx.OpenBinary(b)
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if err != nil {
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return nil, errz.Errorf("unable to open XLSX file: ", d.src.Location, err)
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}
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hasHeader, _, err := options.HasHeader(d.src.Options)
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if err != nil {
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return nil, err
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}
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for _, sheet := range xlFile.Sheets {
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tbl := &source.TableMetadata{Name: sheet.Name, RowCount: int64(len(sheet.Rows))}
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if hasHeader && tbl.RowCount > 0 {
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tbl.RowCount--
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}
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colNames := getColNames(sheet, hasHeader)
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// TODO: Should move over to using kind.Detector
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colTypes := getCellColumnTypes(sheet, hasHeader)
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for i, colType := range colTypes {
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col := &source.ColMetadata{}
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col.BaseType = cellTypeToString(colType)
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col.ColumnType = col.BaseType
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col.Position = int64(i)
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col.Name = colNames[i]
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tbl.Columns = append(tbl.Columns, col)
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}
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meta.Tables = append(meta.Tables, tbl)
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}
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return meta, nil
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}
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// TableMetadata implements driver.Database.
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func (d *database) TableMetadata(ctx context.Context, tblName string) (*source.TableMetadata, error) {
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b, err := d.files.ReadAll(d.src)
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if err != nil {
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return nil, errz.Err(err)
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}
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xlFile, err := xlsx.OpenBinary(b)
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if err != nil {
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return nil, errz.Errorf("unable to open XLSX file: ", d.src.Location, err)
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}
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hasHeader, _, err := options.HasHeader(d.src.Options)
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if err != nil {
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return nil, err
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}
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for _, sheet := range xlFile.Sheets {
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if sheet.Name != tblName {
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continue
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}
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tbl := &source.TableMetadata{Name: sheet.Name, RowCount: int64(len(sheet.Rows))}
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if hasHeader && tbl.RowCount > 0 {
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tbl.RowCount--
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}
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colNames := getColNames(sheet, hasHeader)
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// TODO: Should move over to using kind.Detector
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colTypes := getCellColumnTypes(sheet, hasHeader)
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for i, colType := range colTypes {
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col := &source.ColMetadata{}
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col.BaseType = cellTypeToString(colType)
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col.ColumnType = col.BaseType
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col.Position = int64(i)
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col.Name = colNames[i]
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tbl.Columns = append(tbl.Columns, col)
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}
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return tbl, nil
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}
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return nil, errz.Errorf("table %q not found", tblName)
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}
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// Close implements driver.Database.
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func (d *database) Close() error {
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d.log.Debugf("Close database: %s", d.src)
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// No need to explicitly invoke c.impl.Close because
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// that's already added to c.clnup
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return d.clnup.Run()
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}
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